What type of black are you trying to achieve? There is plain flat black, faded black, glossy black leather, etc. The colors and techniques to get those effects will be different.This should probably be on DakkaDakka or Warseer, but I'm not a member of those sites so I'll try here.
Does anyone know the recipe for painting black to achieve Golden Demon or 'Eavy Metal results? I'm thinking of using it on Legion of the Damned marine chapter.